横向电感膜片微波矩形波导的传输特性

以微波传输线等效二端口网络模型等效电路理论近似分析了含有横向电感膜片矩形波导的结构。计算发现，矩形波导内置一对膜片时膜片的宽度会影响散射参数的相位和振幅，而膜片放置的位置对散射参数的幅值及带宽没有影响。根据微波无反射传输的条件，研究了微波矩形波导内置两组横向电感膜片结构的转移矩阵。采用Matlab编程计算，得到在插入衰减最小时两组膜片在波导中的最佳间距。等效电路理论计算结果与用CST软件仿真的结果相符。研究发现，在膜片间距取最佳值时，两种方法得到的相对带宽差值仅为0.59%。

Transmission characteristics of microwave rectangular waveguide

The structure of the rectangular waveguide with transverse inductive diaphragms is approximately analyzed with the equivalent circuit theory of microwave transmission line two port network. Calculation result shows that the widths of a pair of diaphragms can affect the phase and amplitude of the scattering parameter, but the diaphragm positions have no effect on the magnitude of the scatting parameter and the bandwidth. Microwave equivalent circuit transfer matrix of the rectangular waveguide with two pairs of symmetrical inductive diaphragms is studied with Matlab according to the counteracting of incidence and reflection, i.e. no reflection requirement. Longitudinal optimum spacing between two pairs of diaphragms is calculated on the basis of least insert attenuation. The bandwidth obtained with microwave equivalent circuit theory and the result of the high frequency electromagnetic field software CST are nearly consistent, the difference between them is only 0.59%. The results have some significance for design of rectangular waveguide filters applied to high frequency power vacuum device.